A bit further down this thread Roberto refers to activating the autofocus feature of the Sigma 300-800 when used with the Sigma 1.4x and 2x TC. He indicates that there is an "easy" fix for this and that you might know how to do this. Can you please give any information about this?

regards,

BPB (Bryan)

Hi Bryan just look at the link a hidden page on my web site for a image of the sigma tc near the bottom of the page.